Improved propane recovery methods

F - Mech Eng,Light,Heat,Weapons – 25 – J

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

F25J 3/00 (2006.01) F25J 3/02 (2006.01)

Patent

CA 2349296

The present invention is directed to methods for separating and recovering propane, propylene and heavier hydrocarbons, i.e., the C3+ hydrocarbons, from a gas feed (10), e.g., raw natural gas or a refinery or petroleum plant gas stream. These methods employ sequentially configured first (20) and second (73) distillation columns, e.g., a de-methanizer tower (20) followed by a de- ethanizer tower (73). A cooled gas feed condensate is separated in the first column into methane and a liquid phase comprising ethane and heavier hydrocarbons. The liquid phase is separated in the second column (73) into a gas phase (77) primarily comprising ethane and a second liquid phase primarily comprising the desired C3+ hydrocarbons. At least a portion of the second gas phase (45) is introduced into the first distillation column as an overhead reflux to improve the separation of C3+ hydrocarbons. The methods of the present invention permit separation and recovery of more than about 99 % of the C3+ hydrocarbons in the gas feed at higher operating pressures.

L'invention concerne des procédés de séparation et de récupération de propane, de propylène et hydrocarbures plus lourds, par exemple, les hydrocarbures C¿3+?, à partir d'une charge gazeuse (10), par exemple du gaz naturel brut ou un courant gazeux d'une installation de raffinage ou de pétrole. Dans ces procédés, on emploie successivement des première (20) et seconde (73) colonnes de distillation, par exemple une tour de déméthanisation (20) puis une tour de déséthanisation (73). On sépare un condensat de charge gazeuse refroidie, dans la première colonne, pour obtenir du méthane et une phase liquide comprenant de l'éthane et des hydrocarbures plus lourds. On sépare la phase liquide, dans la seconde colonne (73), pour obtenir une phase gazeuse (77) comprenant principalement de l'éthane et une seconde phase liquide comprenant en majeure partie les hydrocarbures C¿3+? recherchés. On introduit au moins une portion de la seconde phase gazeuse (45) dans la première colonne de distillation, en tant que reflux, afin d'améliorer la séparation des hydrocarbures C¿3+?. Les procédés de l'invention permettent de séparer et récupérer plus de 99 % environ des hydrocarbures C¿3+? dans la charge gazeuse, à des pression de fonctionnement supérieures.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Improved propane recovery methods does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Improved propane recovery methods, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Improved propane recovery methods will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1733799

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.